JP6860318B2 - Manufacturing method of lid for underground structure - Google Patents

Description

The present invention relates to, for example, a lid attached to an underground structure such as a manhole.

Patent Document 1 below proposes a lid for an underground structure (manhole iron lid) of this type. In the case of a lid for an underground structure, a pattern may be applied to the surface thereof, as in the case of the lid body of Patent Document 1. In the lid body of Patent Document 1, the design is formed by providing a large number of convex portions protruding from the surface with reference to the surface of the lid body body, or a concave portion recessed with respect to the surface with reference to the surface. Is provided in large numbers.

Japanese Unexamined Patent Publication No. 2001-140273

Such a pattern on the lid is formed in consideration of slip resistance. Especially in recent years, the design is attached to this kind of lid, which tends to be dry and tasteless, and tends to entertain the viewer as a part representing the culture of the land where the lid is installed. Therefore, this is preferably clear when forming a pattern on the lid.

However, like the lid body disclosed in Patent Document 1, the design is formed with a large number of convex portions protruding from the surface with reference to the surface of the lid body body, or is formed with reference to the surface. It may not always be clear if it is formed by providing a large number of recesses with respect to the surface.

Therefore, an object of the present invention is to provide a lid for an underground structure capable of clarifying a symbol when forming the symbol while ensuring slip resistance.

The lid for an underground structure of the present invention is a cast product having a plate-shaped lid body and an uneven region, and the concave and convex region is a region extending along the surface direction of the main body surface of the lid body. The uneven region is provided with a region surface, and the region surface is characterized in that it has a concave-convex shape obtained by transferring a concave-convex shape in which fragile and irregularly shaped particles are randomly arranged.

In the lid for an underground structure of the present invention having the above structure, the uneven region is provided with a region surface formed by transferring the uneven shape in which fragile and irregularly shaped particles are randomly arranged. The slip resistance is ensured, and the surface of the region in the concavo-convex region is integrated with the lid body by casting by transferring the concavo-convex shape, and such a concavo-convex shape portion is not peeled off by an external force, and is therefore necessary. Anti-slip resistance is ensured for a long period of time.

In the lid for an underground structure of the present invention, the concavo-convex regions are arranged at a plurality of locations, and these concavo-convex regions are arranged apart from the surface of the main body of the lid in the thickness direction of the lid. Each of the uneven regions can be surrounded by a rising surface which is a side surface of a rising portion protruding from the surface of the main body.

In the lid for an underground structure having the above configuration, the uneven region is surrounded by the rising surface which is the side surface of the rising portion protruding from the surface of the main body, so that the boundary between the uneven region and the surface of the main body becomes clear.

In the lid for an underground structure of the present invention, the rising surface can adopt a structure in which the edging of the pattern to be applied is used.

In the lid for an underground structure having the above configuration, the design may be formed by a part of the main body surface or only by an uneven region, and in any case, the rising surface rises from the main body surface. As a result, the boundary between the applied design and the other parts is clear, so that the design can be clearly seen and taken.

In the lid for an underground structure of the present invention, a configuration in which the rising surface dimension of the rising surface in the rising direction is 1 to 5 mm can be adopted.

In the lid for an underground structure having the above configuration, the rising surface dimension of the rising surface is 1 to 5 mm, so that the boundary between the design to be applied and the other parts is clarified.

In the lid for an underground structure of the present invention, the concave-convex region can adopt a structure formed by transferring the shape of a part of the granules having a size of 1 to 5 mm.

In the lid for an underground structure having the above structure, a part of the shape of the granules having a size of 1 to 5 mm is transferred to clarify the existence of the uneven region and secure the slip resistance.

In the lid for an underground structure of the present invention, the design can be clarified when the design is formed while ensuring slip resistance.

It is a top view of the lid which represents the 1st Embodiment of this invention. It is sectional drawing of the same use state. It is an enlarged end view of the same part (end view of line AA in FIG. 1). It shows the result of the slip resistance test, and is the test result in a dry state. It shows the result of the slip resistance test, and is the test result in a wet state. It is a partially enlarged end view of the lid body which shows the other embodiment of this invention.

Hereinafter, a lid for an underground structure (hereinafter, simply referred to as a “lid”) according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the lid body will be described as a lid body for a manhole.

As shown in FIGS. 1 and 2, the lid 1 is used for a manhole (not shown) attached to a pavement (sidewalk). The lid 1 is configured to be able to close the central hole 3 of the manhole receiving frame (hereinafter, simply referred to as “receiving frame”) 2 embedded so as to be substantially flush with the road surface of the pavement. Since the structure of the receiving frame 2 is general, the description thereof will be given as necessary when the other components are described.

The lid 1 is formed in a disk shape so as to be able to close the central hole 3 of the receiving frame 2. The lid 1 is openable and closable to the receiving frame 2 via a hinge member 4, and is removable. The lid 1 can be locked and unlocked in the receiving frame 2 via the locking device 5. Since the hinge member 4 and the locking device 5 have a general configuration, detailed description thereof will be omitted.

The lid body 1 is raised from the disk-shaped lid body 6 formed with a certain thickness dimension and the body surface 7 of the lid body 6 as shown in FIG. 3, and protrudes from the body surface 7. The rising portion 8 and the uneven region 9 formed on the surface 8a of the rising portion 8 are arranged so as to be separated from the main body surface 7 in the thickness direction of the lid main body 6. Reinforcing ribs 10 are integrally formed on the back surface of the lid body 6. The lid body 6, the rising portion 8, the uneven region 9, and the reinforcing rib 10 are integrally formed of the same casting base material by casting. The diameter of the lid body 6 is set to 634 mm.

The surface 7 of the main body is flat. The rising portion 8 is arranged at a plurality of locations (in this case, a large number of locations) on the surface 7 of the main body, and the uneven region 9 is formed on the surface 8a of each of the rising portions 8. In the present embodiment, the rising portions 8 having the same plan view shape and the rising tops 8 having different planar shapes are arranged at a plurality of places, and these are arranged apart from each other in the plane direction of the main body surface 7 to obtain the figure. As shown in 1, the symbol 11 attached to the surface 7 of the main body is configured. In FIG. 1, dots are attached to the uneven region 9 constituting the symbol 11.

Specifically, in the present embodiment, a symbol 11 that can be reminiscent of a "festival" is provided by a combination of "portable shrine 11A", "plurality of people 11B supporting the portable shrine", "nobori 11C", and the like. This symbol 11 is a creation by the applicant. Further, as the rising portion 8, an annular outer edge portion 11D is provided over the entire outer edge of the main body surface 7 of the lid body 6. The design defined in this embodiment is a concept including not only painting elements but also line elements (straight lines, curves, etc.) and character elements (Japanese, foreign languages, symbols, etc.).

As shown in FIG. 3, the rising surface 8b, which is the side surface of the rising surface 8, is a surface along the thickness direction of the lid body 6. In other words, the rising surface 8b is a surface that is raised from the main body surface 7 and follows a direction substantially perpendicular to the main body surface 7. Each rising surface 8 is surrounded by such a rising surface 8b, and the rising surface 8b is a border of the symbol 11.

In particular, in the outer edge portion 11D of the rising portion 8, the rising surface 8b (see FIG. 1) corresponding to the inner peripheral surface thereof is raised from the main body surface 7, and the rising surface 8b corresponding to the outer peripheral surface is the main body surface. It is raised from the outer edge of 7. The elevating direction dimension (height dimension along the thickness direction of the lid body 6) t1 on the rising surface 8b from the main body surface 7 is preferably 1 to 5 mm, and is set to 5 mm in the present embodiment. The rising direction dimension t1 of the rising surface 8b in each rising surface 8 is formed to be the same.

The uneven region 9 is a portion that functions as a slip resistant portion. The uneven region 9 is integrally formed on the surface 8a of each rising portion 8. Since the lid body 6, the rising portion 8 and the uneven region 9 are integrally formed by solidifying the molten metal of the casting base material, the surface 8a of the rising portion 8 is a virtual surface.

The region surface 9a, which is the surface of the concavo-convex region 9, is formed by transferring the concavo-convex shape formed by randomly arranging fragile and irregularly shaped particles. Aggregate blended in cement concrete and asphalt concrete, crushed stone, metal, glass and the like are used as fragile and irregularly shaped granules.

When an aggregate is used, the particle size corresponding to the fine aggregate is preferable, and the particle size is preferably in the range of about 1 to 5 mm and is not uniform. Therefore, the region surface 9a of the concavo-convex region 9 is a random and non-regular surface, and the concavo-convex surface that protrudes from the surface 8a (the virtual surface) of the rising portion 8 by the size of the minimum particle size to the maximum particle size. This uneven surface is formed by transferring the shape of a part of the granules.

In the present embodiment, a square material is preferably used as the granules, but even so, the uneven corners of the region surface 9a are curved surfaces having a large curvature due to transferability (due to transfer error). It has become. The surface roughness of the region surface 9a is formed in the same manner as the general lid 1 of this type.

As described above, in the lid 1 of the present embodiment, the plate-shaped lid body 6, the rising portion 8, and the uneven region 9 are integrally cast by the same casting base material, and the rising portion 8 is a flat surface. It is raised from the main body surface 7 of the lid main body 6 in the thickness direction of the lid main body 6 with a size of 5 mm and surrounded by the rising surface 8b, and the surface 8a of the rising surface 8 has a particle size of about 1 to 5 mm. In the range of, a concavo-convex region 9 formed by transferring a concavo-convex shape in which fragile and irregularly shaped particles are randomly laid out is formed, and a symbol 11 is formed by the rising portion 8 and the concavo-convex region 9. There is. In the present embodiment, the granules in the range of about 1 to 5 mm are mixed (mixed) and used, and transferred as the region surface 9a of the uneven region 9.

The diameter of the lid body 6 is 634 mm, and the symbol 11 included in the lid 1 is configured to be partitioned on the main body surface 7 by the rising surfaces 8b of the plurality of rising surfaces 8 having a size of 5 mm, and each rising surface is formed. On the surface 8a of 8, a concavo-convex region 9 is formed in which a concavo-convex shape obtained by randomly laying out fragile and irregularly shaped granules in a particle size range of about 1 to 5 mm is transferred. ..

Assuming that the uneven region 9 is formed by arranging and transferring granules having a particle size of 3 mm on the lid body 6 in an orderly manner, about 210 irregularities are formed. Actually, the number of irregularities is less than 210 because a part of the surface 7 of the main body is exposed between the rising portions 8, but the uneven region 9 has a particle size of about 1 to 5 mm. Sufficient slip resistance is realized by transferring a part of the surface shape of the granules. The uneven region 9 is a portion that is integrally formed (transferred) by solidifying the molten metal of the casting base material on the surface 8a of each rising portion 8 and functions as a slip resistant portion. That is, the uneven region 9 does not peel off against an external force, and therefore the required slip resistance can be ensured for a long period of time.

The region surface 9a of such a concavo-convex region 9 is partitioned on the main body surface 7 together with the rising portion 8, and the concavo-convex surface in each concavo-convex region appropriately reflects light in a random direction, and the symbol 11 is present. Is clearly visible to the viewer.

Since the design is made up of a combination of the rising portions 8, the area of the rising portion 8 along the surface direction of the main body surface 7 (the area projected on the main body surface) is larger than the area along the surface direction of the main body surface. It is possible that Therefore, the symbol 11 is set so that such a case does not occur as much as possible.

In the lid 1 of the present embodiment, the uneven region 9 is formed by embedding a part of the granules on the surface of the wooden mold and transferring the surface shape of the granules other than the recessed portion. To. Therefore, in the uneven region 9, the maximum dimension t2 protruding from the surface 8a of the rising portion 8 is slightly smaller than the substantial dimension of the granules used for manufacturing the lid 1. The dimension t2 is preferably 1 to 5 mm, but it is preferable to set t1> t2 within this dimension range because the design becomes clear. For example, t1 = 5 mm, t2 = 3 mm, t1 = 3 mm, t2 = 2 mm and the like. However, t1 = t2 (for example, t1 = t2 = 3 mm, etc.) may be set, or t2> t1 (t1 = 2 mm, t2 = 3 mm, etc.) can be set.

The results of the slip resistance test are shown in FIGS. 4 and 5. This test was conducted using a British portable skid resistance tester, and the numerical unit of the test result is BPN. As test targets, the products according to this embodiment were designated as "stone pattern 1" and "stone pattern 2", and these were compared with "turtle shell pattern", which is a product having a hexagonal pattern that is convex with respect to the main body surface 7.

The "stone pattern 1" is a configuration in which particles having a particle size of 2 to 3 mm are used and these surface shapes are transferred as the uneven surface of the uneven region 9. The "stone pattern 2" is a configuration in which particles having a particle size of 3 to 5 mm are used and these surface shapes are transferred as the uneven surface of the uneven region 9. In each case, t1 = 5 mm. As for the "turtle shell pattern", the amount of protrusion of the pattern portion was set to 7 to 6 mm on the surface of the main body.

As a result of performing slip resistance tests five times for each test piece, it was found that "stone pattern 1" and "stone pattern 2" were superior in slip resistance to "turtle shell pattern". It was also found that the slip resistance in the wet environment of FIG. 5 was particularly excellent with respect to the slip resistance in the dry environment of FIG.

Therefore, in the above embodiment, the granular materials having a particle size of about 2 to 5 mm are mixed and a part of the surface shape thereof is transferred to form the uneven region 9, but the granular materials having a particle size of 2 to 3 mm, 3 to 3 Concavo-convex regions 9 may be formed using granules having a particle size of 5 mm. Such a particle size is a value that does not depend on the diameter of the lid 1.

In the above embodiment, the rising direction dimension t1 of each rising portion 8 forming the symbol 11 is the same. However, the rise direction dimension t1 of the rise 8 can be made different. Further, in each of the above embodiments, the symbol 11 is applied to the surface 7 of the main body. However, the rising portion 8 can be formed over the entire surface of the main body surface 7 without applying the symbol 11, and the entire surface of the surface 8a of the rising portion 8 can be formed as the uneven region 9. In this case, the rising surface 8b is an annular surface that is raised in the thickness direction of the lid body 6 with respect to the outer edge surface of the lid body 6. Further, it is also possible to form the uneven region 9 over the entire surface of the main body surface 7 without forming the rising surface 8 (standing surface 8b). In this case, no design is applied, and the required slip resistance can be ensured for a long period of time.

In each of the above embodiments, the case where the symbol 11 is formed by the combination of the rising portions 8 is illustrated. However, as shown in FIG. 6, a part of the surface 7 of the main body may be used to form the symbol 11, and a portion other than the symbol 11 may be a rising portion 8. Then, in any of the embodiments, the symbol 11 or the region other than the symbol 11 can be colored.

The lid body of the present invention is not limited to application to manholes for water and sewage, and can be applied to hand holes and lid bodies covering structures for underground buried objects such as electrical wiring.

1 ... lid, 2 ... receiving frame, 6 ... lid body, 7 ... body surface, 8 ... rising surface, 8a ... surface, 8b ... rising surface, 9 ... uneven area, 9a ... area surface, 11 ... design, 11D ... Outer edge

Claims (5)

It is a cast product provided with a plate-shaped lid body and an uneven region, and the concave-convex region is a region extending along the surface direction of the main body surface of the lid body, and the concave-convex region includes a region surface. The region surface is a method for manufacturing a lid for an underground structure having an uneven shape.
The uneven shape is such that fragments of irregularly shaped granules are randomly laid on the surface of a wooden mold used for casting, and a part of the granules is embedded, and the granules other than the recessed portion are embedded. manufacturing method of underground construction for the lid, characterized that you have been formed by casting such that the surface shape of is transferred to the region surface. In the lid body for an underground structure, the uneven regions are arranged at a plurality of locations, and these uneven regions are arranged so as to be separated from the main body surface of the lid body in the thickness direction of the lid main body. each irregular region is, the manufacturing method of the underground construction for closure of claim 1 which is cast into so that is surrounded by the raised surface is a raised portion of the side surface projecting from said body surface. The standing upper surface, a manufacturing method of the underground construction for closure of claim 2 in which edges Ru is cast so that such a removal of symbols to be subjected. Startup dimension The production method of underground structures for closure of claim 2 or claim 3 Ru is cast so as to be 1~5mm of the standing upper surface. The granulates method of underground structures lid body according to any one of請Motomeko 1 to claim 4 that have a size of 1 to 5 mm.

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